Backed out 8 changesets (bug 1561227) for failures on browser_viewport_resizing_scrollbar.js. CLOSED TREE

Backed out changeset 8117cafb3a20 (bug 1561227)
Backed out changeset 635534927ffc (bug 1561227)
Backed out changeset 693b0dd88f2b (bug 1561227)
Backed out changeset 257bc09f49af (bug 1561227)
Backed out changeset 1b63d555c6c1 (bug 1561227)
Backed out changeset 677da957ddcb (bug 1561227)
Backed out changeset f8b8e593316f (bug 1561227)
Backed out changeset 849e1cf51a8f (bug 1561227)

--HG--
rename : devtools/client/responsive/test/browser/browser_viewport_zoom_toggle.js => devtools/client/responsive/test/browser/browser_toggle_zoom.js